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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:51292) by pandora.armlinux.org.uk with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kX6lz-0007tZ-Om; Mon, 26 Oct 2020 17:59:11 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1kX6lt-0003CE-Co; Mon, 26 Oct 2020 17:59:05 +0000 Date: Mon, 26 Oct 2020 17:59:05 +0000 From: Russell King - ARM Linux admin To: Xiaoming Ni Subject: Re: ping //Re: [PATCH v2] arm:traps: Don't print stack or raw PC/LR hex values in backtraces Message-ID: <20201026175904.GH1551@shell.armlinux.org.uk> References: <20201016023141.85300-1-nixiaoming@huawei.com> <23a3ce81-e1b6-337f-c217-5027134c0131@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <23a3ce81-e1b6-337f-c217-5027134c0131@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201026_140240_035808_7EE6230D X-CRM114-Status: GOOD ( 21.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wangle6@huawei.com, walken@google.com, amanieu@gmail.com, dima@arista.com, bigeasy@linutronix.de, vincent.whitchurch@axis.com, linux-kernel@vger.kernel.org, mingo@kernel.org, ben.dooks@codethink.co.uk, tglx@linutronix.de, viro@zeniv.linux.org.uk, jpoimboe@redhat.com, luohaizheng@huawei.com, akpm@linux-foundation.org, ldufour@linux.ibm.com, will@kernel.org, christian.brauner@ubuntu.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Oct 26, 2020 at 02:33:10PM +0800, Xiaoming Ni wrote: > ping The arm tree was closed due to the merge window, and thus patches do not get applied at that point. Plus I tend not to review development patches during the merge window. > On 2020/10/16 10:31, Xiaoming Ni wrote: > > Printing raw pointer values in backtraces has potential security > > implications and are of questionable value anyway. > > > > This patch follows x86 and arm64's lead and removes the "Exception stack:" > > dump from kernel backtraces: > > commit a25ffd3a6302a6 ("arm64: traps: Don't print stack or raw > > PC/LR values in backtraces") > > commit bb5e5ce545f203 ("x86/dumpstack: Remove kernel text > > addresses from stack dump") > > > > Signed-off-by: Xiaoming Ni > > > > ------- > > v2: > > Delete [] from the stack according to the email discussion > > in patch V1, Other information processing will be discussed in subsequent > > patches. > > > > v1: https://lore.kernel.org/lkml/20201009075957.110017-1-nixiaoming@huawei.com/ > > 1. Don't print stack or raw PC/LR hex values in backtraces > > 2. Don't print stack mem in backtraces > > 3. if (!panic_on_oops), Don't print stack mem in __die() > > --- > > arch/arm/kernel/process.c | 3 +-- > > arch/arm/kernel/traps.c | 4 ++-- > > 2 files changed, 3 insertions(+), 4 deletions(-) > > > > diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c > > index 8e6ace03e960..71c9e5597d39 100644 > > --- a/arch/arm/kernel/process.c > > +++ b/arch/arm/kernel/process.c > > @@ -121,8 +121,7 @@ void __show_regs(struct pt_regs *regs) > > printk("PC is at %pS\n", (void *)instruction_pointer(regs)); > > printk("LR is at %pS\n", (void *)regs->ARM_lr); > > - printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n", > > - regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr); > > + printk("psr: %08lx\n", regs->ARM_cpsr); > > printk("sp : %08lx ip : %08lx fp : %08lx\n", > > regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); > > printk("r10: %08lx r9 : %08lx r8 : %08lx\n", > > diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c > > index 17d5a785df28..911bbf164875 100644 > > --- a/arch/arm/kernel/traps.c > > +++ b/arch/arm/kernel/traps.c > > @@ -68,8 +68,8 @@ void dump_backtrace_entry(unsigned long where, unsigned long from, > > unsigned long end = frame + 4 + sizeof(struct pt_regs); > > #ifdef CONFIG_KALLSYMS > > - printk("%s[<%08lx>] (%ps) from [<%08lx>] (%pS)\n", > > - loglvl, where, (void *)where, from, (void *)from); > > + printk("%s (%ps) from (%pS)\n", > > + loglvl, (void *)where, (void *)from); > > #else > > printk("%sFunction entered at [<%08lx>] from [<%08lx>]\n", > > loglvl, where, from); > > > > -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. 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